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SHARE-BASED AWARDS - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Number of Options (in thousands)    
Beginning balance (in shares) | shares 14,546  
Granted (in shares) | shares 0  
Exercised (in shares) | shares (2,321)  
Forfeited (in shares) | shares (278)  
Expired (in shares) | shares (225)  
Ending balance (in shares) | shares 11,722 14,546
Exercisable (in shares) | shares 11,119  
Weighted- Average Exercise Price    
Beginning balance (in dollars per share) | $ / shares $ 2.12  
Granted (in dollars per share) | $ / shares 0  
Exercised (in dollars per share) | $ / shares 1.33  
Forfeited (in dollars per share) | $ / shares 4.05  
Expired (in dollars per share) | $ / shares 0.76  
Ending balance (in dollars per share) | $ / shares 2.26 $ 2.12
Exercisable (in dollars per share) | $ / shares $ 2.02  
Weighted-Average Remaining Contractual Term (in years) and Aggregate Intrinsic Value    
Weighted-average remaining contractual term (in years), outstanding 4 years 4 years 8 months 12 days
Weighted-average remaining contractual term (in years), exercisable 3 years 10 months 24 days  
Aggregate intrinsic values | $ $ 30 $ 182
Exercisable, aggregate intrinsic value | $ $ 30